What is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

M = No. of moles of solute / Volume of solution in litres

HBr: H = 1 x 1 = 1 Br = 1 x 80

Molar mass : 81 g / mol

a. n = 27.7% / 100 = 0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml; D = m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L

c. M = n / V

= 0.0034 mol / 0.065 L

M = 0.052 mol / L

The molarity of the concentrated HBr solution is 0.052 mol/L